[patch] Forward scroll and unused button events to the window manager

[Nils Rennebarth]

Hi,

I implemented Olivers advice to make xfdesktop forward scrolls and 
unused button presses/releases that have been caught by its virtual root 
to the real root window (i.e. the window manager).

That makes it possible to remove the "workspace switch by scroll on 
background" feature from the xfdesktop implementation and solely rely on 
the window manager to implement it.

Together with my other patch from yesterday, said feature is now 
optional and enabled by default.

Patch against current CVS attached. Works here, but I may have missed 
some finer points.

-- 
                                      ______
                                     (Muuuhh)
Global Village Sau  ==>        ^..^ |/¯¯¯¯¯
(Kann Fremdsprache) ==>        (oo)
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